Flavor structure of the nucleon as revealed at HERMES.

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The flavor structure of the nucleon as revealed in parton distributions (PDF's) is central to understanding the partonic structure of the nucleon. Recent data on unpolarized PDF's and their implications for the flavor-dependent quark helicity distributions are discussed. Results are presented for spin asymmetries in inclusive and semi-inclusive cross sections for production of pions, and kaons measured by the HERMES experiment in deep-inelastic scattering of polarized positrons on proton and deuterium Targets. A full 5 component extraction of polarized quark distributions for u, d, {bar u}, {bar d}, and (s + {bar s}) is reported. Resulting valence quark distributions conform ... continued below

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12 pages

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Jackson, H. E. September 5, 2002.

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The flavor structure of the nucleon as revealed in parton distributions (PDF's) is central to understanding the partonic structure of the nucleon. Recent data on unpolarized PDF's and their implications for the flavor-dependent quark helicity distributions are discussed. Results are presented for spin asymmetries in inclusive and semi-inclusive cross sections for production of pions, and kaons measured by the HERMES experiment in deep-inelastic scattering of polarized positrons on proton and deuterium Targets. A full 5 component extraction of polarized quark distributions for u, d, {bar u}, {bar d}, and (s + {bar s}) is reported. Resulting valence quark distributions conform to results of earlier experiments. There is no evidence for a significant polarization of the light sea. In contrast to the conclusions inferred from studies of polarized inclusive scattering, a leading order analysis of the HERMES data suggests a zero or slightly positive polarization of the strange sea. There is no evidence for a measurable flavor asymmetry in the polarized distributions for the light sea.

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12 pages

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  • NATO Advanced Spin Physics Workshop, Yerevan (AM), 06/30/2002--07/03/2002

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  • Report No.: ANL/PHY/CP-108601
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 801582
  • Archival Resource Key: ark:/67531/metadc739666

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 5, 2002

Added to The UNT Digital Library

  • Oct. 19, 2015, 7:39 p.m.

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  • March 21, 2016, 5:49 p.m.

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Jackson, H. E. Flavor structure of the nucleon as revealed at HERMES., article, September 5, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc739666/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.